hp per liter
seconds @ 108 mph
(from General Motors
Press Release) PONTIAC ANNOUNCES THE 2009 G8 GXP
High-Performance Flagship Combines Progressive Design and
NEW YORK Today Pontiac announced the flagship of its GXP
performance series, the G8 GXP high-performance sedan, at the New
York Auto Show. This 2009 model will join the Solstice, G6 and
Torrent GXP models in Pontiac dealerships in late 2008. The G8 GXP
takes the G8s responsive driving experience, refined passenger
environment and aggressive good looks to a new level. It also
delivers an enjoyable driving experience, thanks to a 6.2L V-8 that
produces in excess of 400 horsepower.
More than just raw power, the GXP delivers the sophisticated yet
exciting driving experience that enthusiasts expect in a car costing
far more than the GXP, said Jim Bunnell, Buick-Pontiac-GMC general
The heart of the G8 GXP is the 6.2L LS3 small-block V-8, currently
rated at 402 horsepower (300 kW)* and 402 lb.-ft. of torque (546
Nm)* pending final SAE certification. This engine is the newest
member of GMs small-block V-8 family. It features a revised,
larger-bore cylinder block, high-flow, L92-style cylinder heads;
larger-diameter pistons; unique camshaft and camshaft timing;
revised valvetrain with offset intake rocker arms; high-flow intake
manifold; and high-flow fuel injectors.
The LS3 engine has an aluminum cylinder block with cast-in-place
iron cylinder liners. Larger bores help create a 376-cubic-inch
displacement. The block casting also features revisions and
machining in the bulkheads to enhance its strength and improve
bay-to-bay breathing. New pistons were designed for high-rpm
New, high-flow cylinder heads aid engine breathing and are based on
the large port and valve design found on the LS7 engine and other GM
L76 engines. The larger-capacity, straighter intake port-design
optimizes intake flow to the combustion chamber, an effect augmented
by large valves, measuring 2.16 inches (55.0 mm) on the intake side
and 1.59 inches (40.4 mm) on the exhaust side.
Pending final testing, the G8 GXP is expected to deliver 0-to-60 mph
performance of about 4.7 seconds, and a quarter-mile time of 13.0
seconds at 108 mph.
Six on the floor
A new six-speed Tremec TR6060 manual transmission is optional on the
G8 GXP. This next-generation manual smoothly transfers the engines
power and torque to the rear wheels with a reduction in shift throw.
The transmission features a host of refinements including premium
gear synchronizers; stronger gears, housing, and bell housing; a
single-piece counter shaft; and machined gear teeth.
The standard Hydra-Matic six-speed 6L80 automatic transmission is
technologically advanced and robust. It uses a clutch-to-clutch
operation and an integrated 32-bit transmission controller to
deliver smooth and precise shifts. The six-speed has a generous
6.04:1 overall ratio that enables a steep first-gear. The result
is strong launch acceleration along with tall overdrive ratios
that lower engine rpms for better fuel economy and reduced noise.
A 3.27 final drive ratio comes with automatic-equipped GXPs, and a
3.70 gear is matched with the manual transmission. A limited-slip
differential is standard.
The G8 GXP rides on the G8s 114.8-inch (2915 mm) wheelbase with
wide front ( 62.7 inches / 1,592 mm) and rear ( 63.3 inches / 1,608
mm) tracks. The four-wheel independent suspension is fully
adjustable and is tuned for the highest performance in the G8
family. The GXPs ride and handling was developed and validated on
racetracks and highways around the world, including the famed
Nrburgring racing circuit. It rewards the driver with sharp,
immediate responses, as well as a well-balanced road feel during
The suspension employs a MacPherson strut design in the front and a
four-link, coil-over-shock design in the rear. A direct-acting front
stabilizer bar, decoupled rear stabilizer bar and lateral ball
joints on the rear suspension deliver increased lateral stiffness
for more responsive handling. The front suspension features fully
adjustable caster, camber and toe; the rear suspension has fully
adjustable camber and toe, for more precise tuning.
Steering and brakes
The steering rate for the GXP is tuned to provide immediate response
with definitive driver feedback. Like the G8 sedan and GT, the GXPs
steering box is located ahead of the front axle line for a quicker,
more direct feel.
The Brembo braking system matches the GXPs boost in performance
with an equivalent increase in stopping power. The system includes
14-inch (355 mm) vented front and 12.76-inch (324 mm) rear disc
rotors, with special quad-piston alloy calipers in front. The alloy
calipers on the rear brakes have single-piston actuation. The
four-wheel disc brake system includes standard anti-lock brakes and
Wheels and tires
The GXP rides on 19-inch polished aluminum wheels with a special
machined face. Performance-oriented summer P245/40R19 tires are
standard, and a comparable all-season tire is available. Combined
with the suspension and steering enhancements, this setup gives the
GXP exceptional cornering grip.
The G8 GXP exhibits strong Pontiac design cues. A unique front
fascia with a lower splitter and a distinctive rear fascia diffuser
contribute to its sporty look. The dual-port grille, fog lamps, bold
wheels and confident, wheels-at-the-corners stance are all
unmistakably Pontiac traits.
Interior amenities and comfort
The G8 GXPs interior is driver-oriented with aesthetic and tactile
details like instruments with a sporty appearance that match the
cars performance. Interior materials consist of satin and chrome
trim and high-quality textured materials throughout. The instrument
cluster glows with crisp, white light on the primary instruments.
Pontiacs signature red lighting illuminates the rest of the
instrument panel cluster.
Standard comfort and convenience amenities include:
Highly bolstered two-tone sport seats with color-coordinated gauge
cluster and GXP embroidery
Leather-trimmed steering wheel and gear shifter
Power-adjustable front seats
Alloy sport pedals
A 230-watt Blaupunkt audio system
XM Satellite Radio
The seats offer firm support to hold occupants in place during
aggressive cornering. The standard heated leather seats were
designed to deliver excellent comfort during long drives. They are
available in Ebony or an Ebony/Red two-tone.
Maintaining the G8s tradition of a full suite of standard safety
features, the G8 GXP includes:
Four-wheel disc brakes with ABS and traction control
Electronic stability control
Seat-mounted thorax air bags and dual-stage frontal air bags for
front passengers, with automatic passenger sensing system
Roof rail side-impact air bags for both seating rows